Describe and explain the gas exchange that takes place between the leaf of a plant and the air in the atmosphere during a 24-hour period.

Seeds require certain conditions before they will germinate. List these conditions and, for each condition you mentio…

Which feature of root hairs suggests that they take up ions from the soil by active transport?

Table 4.1 shows the loss of water vapour by two similarly-sized potted plants, F and G, grown in the same environment…

Bacteria can be genetically engineered to produce human insulin by adding a human insulin gene to the bacterial DNA. …

A person has blood group A. Which statement about his genotype is correct?

In fruit flies, the allele for an ebony coloured body is recessive to the allele for a grey coloured body. In an inve…